[villagetinker]

I would NOT use the typical existing vinyl cover plates. ACE hardware has the hard plastic ones. These take paint much better. Next, if you are lucky, your granite will be mostly one color. I would take paint swatches that are close, and pick the closest one.

Now, using very fine sandpaper, sand the finish on the new cover plates. Get a good spray primer, and apply 1 or 2 coats of primer, and after this dries completely (1 day) apply your finish coat. I would mention to the salesperson that you are applying the primer to the plastic cover paints, and the final coat will be water based latex paint. Kilz is probably the best primer for this type application.

As I recall some or the stores (ACE, Lowes, home depot) can make small quantities of paint, I think they call them samples.

NOW, if you want to match the pattern of the Granite, you are probably going to need to find an artist to add these. I would follow up with a suitable clear coating.

Hope this helps.